They don't make it easy do they Steve!
The one for you can be found here.
www.bom.gov.au/jsp/watl/weather/obs.jsp?graph=all_obs&station=9977Then click on "24 hr wind". and you should get this..
It is surprising how much the humidity varies during the day... But that may be because the Mandurah station is at the marina and the humidity reflects whether the breeze is "on" or "off" shore.
